System for feeding bristles in a circular arrangement, particularly for use in automatic machines for forming circular brushes

ABSTRACT

A system for feeding a plurality of bristles in a circular arrangement, particularly for use in machines for forming circular brushes, comprises a drum ( 1 ) extending axially along its own axis (X 1 ) and designed to form a plurality of axial channels ( 2   a,    2   b,    2   c,  etc.), each having a cross section in the form of a sector of a circle, in a circular arrangement with the corresponding vertices orientated towards the central axis (X 1 ) of the said drum ( 1 ), and also a replaceable nozzle (B), positioned downstream of the said channels ( 2   a,    2   b,    2   c,  etc.) with respect to the direction of feeding of the bristles and designed to form an internal truncated conical cavity tapered from the upstream to the downstream end and having an outlet aperture ( 5 ). In order to change the maximum diameter of the circular arrangement of the bristles being fed, the said nozzle ( 4 ) is replaced with one having an outlet aperture ( 5 ) with a different diameter.

FIELD OF THE INVENTION

The present invention relates to a system for feeding bristles in a circular arrangement, particularly for use in automatic machines for forming circular brushes.

More particularly, the present invention relates to a system of the aforesaid type, particularly for use in an automatic machine of the type described and illustrated in Italian Patent no. IT-01.309.972, (corresponding to European Patent number EP-1.044.628.B1 and to the U.S. Pat. No. 6,578,928.B1).

BACKGROUND OF THE INVENTION

At the present time—see for example the cited patent IT-01.309.972, (corresponding to European Patent number EP-1.044.628.B1 and to the U.S. Pat. No. 6,578,928.B1)—the known system for feeding a plurality of bristles in a circular arrangement in order to insert them between a nut and a ring, has a mechanical assembly including:—a plurality of telescopic tubes, each having a circular cross section, positioned at equal circumferential intervals;—clamp means, positioned upstream of the said group of telescopic tubes, for gripping the bundles of continuous bristles arriving from the reels; and—cutting means, positioned downstream of the said telescopic tubes, for cutting, downstream of the said tubes, the bristles of the bundles positioned in the said tubes and for forming a circular exit aperture for the bristles being fed.

With this system, in order to feed the bristles in a circular arrangement, the bristles are gripped in the proximity of the clamp means and the clamp means are then translated towards the cutting means.

Also with this system, when it is necessary to change the diameter of the circular arrangement of the bristles being fed towards the nut and ring, for example if there is a change in the internal diameter of the ring and/or in the outside diameter of the corresponding nut, then, in order to form a circular brush having a different configuration, it is necessary to replace the aforesaid mechanical assembly, comprising telescopic tubes, clamp means and cutting means, in order to fit a different mechanical assembly, in which the telescopic tubes are positioned at equal circumferential intervals around a circumference having a lesser or greater diameter, with corresponding clamp means and cutting means.

Clearly, therefore, the operations for changing the configuration are labour-intensive and complicated.

The object of the present invention is to overcome the aforesaid drawbacks.

SUMMARY OF THE INVENTION

The invention, which is protected by the claims, resolves the problem of creating a system for feeding a plurality of bristles in a circular arrangement, particularly for use in automatic machines for forming circular brushes, the said system being characterized in that it comprises:—a drum extending axially along its own axis and designed to form a plurality of axial channels, each having a cross section in the form of a sector of a circle, in a circular arrangement with the corresponding vertices orientated towards the central axis of the said drum; and—a replaceable nozzle positioned downstream of the said channels with respect to the direction of feeding of the bristles and designed to form an internal truncated conical cavity tapered from the upstream to the downstream end and having an outlet aperture; in which, in order to change the maximum diameter of the circular arrangement of the bristles being fed, the said nozzle is replaced with one having an outlet aperture with a different diameter.

By using a system of the aforesaid type, it is possible to carry out a change of configuration with respect to the diameter of the circular arrangement of the bristles being fed, and a change of configuration with respect to the number of bristles, in an easy and rapid way, thus reducing the operating time.

BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristics and advantages of the present invention will be made clearer by the following detailed description of some preferred embodiments, provided purely by way of example and without restrictive intent, with reference to the figures of the attached drawings, in which:

FIG. 1 is a schematic perspective view of a first embodiment of the present invention;

FIG. 1A is an exploded view of two details of FIG. 1;

FIG. 2 is a schematic view of the embodiment of FIG. 1 in section along a longitudinal median plane;

FIG. 3 shows the system of the preceding figures applied in an automatic machine for forming circular brushes;

FIG. 4 shows a variant embodiment of the system according to the present invention;

FIG. 5 shows the system of FIG. 4 in section along a vertical longitudinal plane of FIG. 4;

FIGS. 5A, 5B and 5C show, respectively, sectional views along the lines A-A, B-B and C-C of FIG. 5.

SPECIFIC DESCRIPTION

With reference to the following description, the system according to the present invention is particularly suitable for application to circular brush forming machines of the type described and illustrated in Italian Patent no. IT-01.309.972 (i.e. EP-1.044.628.B1 and/or U.S. Pat. No. 6,578,928.B1), the contents of which are expressly referred to in relation to the present invention.

With reference to FIGS. 1 and 2, the system for feeding a plurality of bristles comprises a drum 1, including a plurality of sliding channels 2 a, 2 b, 2 c, 2 d, etc., positioned at equal circumferential intervals and extending longitudinally, each having a cross section in the form of a sector of a circle, with the corresponding vertices orientated towards the central longitudinal axis X1 of the said circumferential arrangement of the channels 2 a, 2 b, 2 c, etc.

In the proximity of the downstream end of the said drum 1 there are positioned engagement and release means 3, designed to be replaceable and to fix in position a nozzle 4, which has a truncated conical internal cavity 4 a tapering from the upstream to the downstream end, in which the said truncated conical cavity (see FIG. 2) has a maximum diameter upstream substantially equal to the maximum diameter formed by the channels 2 a, 2 b, 2 c, etc., and, at its downstream end, a circular outlet aperture 5, having a diameter chosen to match the size of the configuration of the brush to be formed, as explained more fully below.

Preferably, the said engagement and release means 3 have, for example, an external thread 3 a, which is positioned in the proximity of the downstream portion of the said drum 1, and which is designed to engage with an internal thread 3 b formed in an upstream portion of the nozzle 4.

In the proximity of the central axis X1 of the said drum 1 (see FIG. 2) there is optionally positioned a cylindrical shaft 20, which is preferably axially retractable into the said drum 1 and is elastically stressed towards the extended position by a spring 21.

Clearly, therefore—see in particular FIG. 3 (and FIGS. 5 and 5C for the other embodiment) owing to the particular shape mentioned above, each of the aforesaid channels 2 a, 2 b, 2 c, etc. can contain, without the replacement of configuration parts, either a large or a small number of bristles 10, and furthermore the said bristles 10, advancing in a downstream direction, that is to say towards the outlet aperture 5 of the nozzle 4 and towards the distal portion of the central shaft 20 and/or towards a mandrel and nut 6-7, will all be fed downstream in the form of a circular ring and will be inserted correctly between the mandrel and nut 6-7 and a ring 8 supported by positioning means 9, where the said mandrel and nut 6-7 and the said positioning means and ring 9-8 are present in a circular brush forming machine, such as a machine described in the previously cited Italian Patent no. IT-01.309.972 (i.e. EP-1.044.628.B1 and/or U.S. Pat. No. 6,578,928.B1).

With reference to the particular mode of feeding the bristles in the form of a circular ring (see FIG. 2), the maximum diameter of the said ring is determined by the diameter of the outlet aperture 5 of the nozzle 4, namely D1, and the minimum diameter of the said ring is determined by the diameter of the distal end of the shaft 20, namely D0.

In the particular operating configuration shown in FIG. 3, the minimum diameter is determined by the diameter of the mandrel and nut 6-7 positioned centrally, preferably within the said outlet aperture 5, and against the distal end of the shaft 20.

With reference to the central shaft 20 (see FIG. 2), it is also optionally possible to provide, if necessary, a distal end which can support a replaceable cone 20 a, positioned preferably with a taper towards the upstream end, so that the profile and/or the diameter D0 of the distal-terminal portion of the said shaft 20 can be modified, by replacing the said cone 20 a, with respect to the profile of the mandrel and nut 6-7, to improve the sliding and insertion flow of the bristles 10.

Similarly, the mandrel and nut assembly 6-7 is also replaceable, making it possible to change the minimum diameter of the circular ring configuration of the bristles being fed and/or the diameter of the nut 7.

Thus, with reference to what has been stated above, regardless of the means used to advance the bristles 10 in the downstream direction, as explained more fully below, it is possible, by using the system described above comprising the drum 1 and nozzle 4, to rapidly change the maximum diameter of the circular ring arrangement of the bristles 10 being fed, and thus to change the configuration rapidly, simply by replacing the nozzle 4, for example (see FIG. 2) by replacing a first nozzle 4, having an outlet aperture 5 with a diameter D1, with a second nozzle having an outlet aperture with a diameter D2, the latter being shown in broken lines.

Additionally, if it is also desired to change the minimum diameter of the aforesaid circular ring feed of the bristles 10, it is sufficient to make a simple and rapid replacement of the mandrel and nut 6-7 and/or the cone 20 a, if the latter is optionally present and if necessary.

Description of a First Embodiment

With reference to a first preferable embodiment and application of the aforesaid system (see FIG. 3), in order to obtain a longitudinal advance of segments of bristles 10 lying within the channels 2 a, 2 b, 2 c, etc., in order to feed them in a circular ring arrangement and insert them between the nut 7 and the ring 8, the system can comprise expulsion members indicated as a whole by 11, comprising a plurality of pistons 12 a, 12 b, 12 c, 12 d, etc., each having a cross section in the form of a sector of a circle, that is to say a shape such that the pistons mate with and slide longitudinally inside the specific shape of the aforesaid channels 2 a, 2 b, 2 c, 2 d, etc. of the drum 1, in which the said pistons 12 a, 12 b, 12 c, 12 d, etc., are positioned at the distal ends of corresponding rods 13 a, 13 b, 13 c, 13 d, etc., whose opposite ends are fixed to a disc 14, which in turn is driven with a longitudinal motion by means of a fluid dynamic piston 15.

In this embodiment, it is also optionally preferable to provide a guide element 16, comprising a plurality of aligning and centring channels 17 a, 17 b, 17 c, etc., designed to contain and support the pistons in the correct configuration before their active stroke which expels the bristles, as explained more fully below.

With this arrangement, therefore, it is possible to implement a specific operating system comprising the following stages of operation: a)—loading segments of bundles of bristles 10 into one or more circumferential channels 2 a, 2 b, etc. of the drum 1; b)—inserting the pistons 12 a, 12 b, etc. into the upstream ends of the said circumferential channels 2 a, 2 b, etc. of the drum 1; c)—advancing the pistons 12 a, 12 b, etc. along the said channels 2 a, 2 b, etc. and towards the downstream end of the drum 1 to provide a corresponding advance of the segments of bundles of bristles 10 towards and beyond the outlet aperture 5 of the nozzle 4.

With reference to FIG. 3, in this first application of the aforesaid system, there is provided a rotating frame 301, supported rotatably by a fixed tube 302 supported by the machine frame (not shown), in which the said rotating frame 301 is rotated about its longitudinal axis 301 x, for example by means of a hydraulic motor M301 which drives a shaft 303, where the axis of rotation 301 x is positioned parallel to and above an axis 400 x which forms the operating axis of the circular brush forming machine.

The frame 301 is designed to support, in opposition to each other, two drums 101 and 201, substantially identical to the drum 1 described above (similar numbers are therefore used in the numbering), which are supported rotatably about their longitudinal axes 101 x and 201 x, by means of corresponding cylindrical housings 102 and 202, for example, in which the said drums 101 and 201 are positioned rotatably, with the corresponding axes of rotation 101 x and 201 x positioned parallel to the axes 301 x and 400 x.

The said drums 101 and 201 are also associated with corresponding stopping and positioning means 104 and 204, carried by the rotating frame 301 and designed to prevent or allow the rotation of the corresponding drums 101 and 201 about their axes 101 x and 201 x, and also, optionally, designed to establish, for each drum 101 and 201, one or more rotational positions, in which the channels 2 a, 2 b, 2 c, etc: are correctly aligned axially with respect to operating means located in two operating stations as described more fully below.

The said stopping and positioning means 104 and 204 can be of various types, for example mechanical and/or electromechanical and/or optoelectromechanical types, consisting for example of an electromechanical clutch 105 and 205 designed to interact with a disc 106 and 206 which has axial seats and/or stops spaced at equal circumferential intervals, to establish a plurality of desired angular positions for the drums 101 and 201.

With this arrangement, therefore, the two drums 101 and 201 can be translated along a circular path, and, for reasons which are given below, each drum 101 or 201 can be stopped in a first loading station S1, for loading segments of bristles into one or more of the channels 2 a, 2 b, etc., or in a second expulsion station S2, for feeding the bristles 10 in a circular arrangement, the central axis of rotation 101 x or 201 x of the corresponding drum 101 or 201 being aligned with the axis 400 x of the circular brush forming machine.

It should be borne in mind that the mandrel 6 carrying the nut 7 is movable longitudinally on command, and therefore, when it is moved to the right with respect to FIG. 3, it does not impede the entry of the drum 101 or 201 into the second station S2.

The first station S1 for loading the bristles is positioned in an upper area, opposite the second station S2 for bristle insertion, in such a way that when a drum 201 is halted in the second station S2 the opposite drum 101 is halted in the first station S1.

The loading station S1 substantially comprises devices for forming and loading segments of bristles 10 into one or more of the channels 2 a, 2 b, etc. of the halted drum 101, and more specifically, it substantially comprises the following, from the upstream to the downstream end:—a first unit 30 for continuous bristle feeding, designed to drive one or more bundles of bristles downstream, comprising for example a pair of driving means with contra-rotating knurled rollers 31 and 32, between which one or more bundles of bristles 10 obtained from the reels are driven and advanced;—a second unit 40 for guiding the bristles, designed to guide the bundles of bristles into one or more channels 2 a of the drum 101 or 201 and to act as a counter-blade, comprising an element 41, supported by the machine frame, having one or more guide channels 41 a, which are positioned facing and aligned with one or more channels 2 a, etc. of the drum 101 or 201, by means of the aforesaid stopping and positioning means 104 and 204, which set the correct angular position for the said drums 101 and 201;—a third unit 50 for cutting, designed to cut, on command, the bundles of bristles 10 after their insertion into one or more channels 2 a, etc., comprising, for example, a blade 51, driven by a fluid dynamic cylinder 52, where the said blade 51 is provided with a profile 51 a such that the insertion of the segments of cut bristle into the channels 2 a, 2 b, etc. is facilitated;—a fourth unit 60 for rotating the drum, designed to rotate, on command, with calibrated angular movements, the drum 101 or 102 positioned and halted in the station S1 during the stages of loading the bristle segments 10, comprising, for example, a device supported at its top by the machine frame, comprising a gear wheel 61, movable axially on command, which can engage on command with a ring gear 103 or 203, positioned on the shell of the drum 201 or 101, the said wheel 61 being driven by a servo motor 63.

With this arrangement, therefore, it is possible to load the channels 2 a, 2 b, 2 c, etc. with segments of bristle 10 in a selective way as desired, for example by carrying out alternate loading, in other words loading the channels 2 a, 2 c, etc. and keeping the channels 2 b, 2 d, etc. empty, or by loading all the channels 2 a, 2 b, etc.

The second station S2 for expelling the bristles substantially comprises the guide element 16, the pistons 12 a, 12 b, etc., and the fluid dynamic cylinder 15, all of which have been described above.

With this arrangement, when a drum 101 or 201, previously loaded with segments of bristles 10, as described above, arrives at the said station S2 and stops there at the side of the guide element 16, it has a rotational position which is fixed and set by the stopping and positioning means 104 and 204, so as to provide a correct longitudinal alignment between the aligning and centring channels 17 a, 17 b, 17 c, etc., and the sliding channels 2 a, 2 b, 2 c, 2 d, etc. of the drum 101 or 201, and therefore, after the mandrel and nut 6-7 have been brought towards and up to the downstream end 20 a of the central shaft 20, the fluid dynamic cylinder 15 is operated, causing the pistons 12 a, 12 b, 12 c, etc. to advance downstream into the sliding channels 2 a, 2 b, 2 c, 2 d, etc., thus feeding the bristles 10 in a circular ring arrangement.

With reference to what has been mentioned above, the operating means mentioned above are associated with each other and controlled by electronic means, such as a PLC and/or a personal computer or other device.

Again with reference to the embodiment described above, it is clear that, in the same way as described above, it is possible to provide three or more drums, supported by an equivalent rotating element 301, and, additionally, two or more stations S1 for loading the bundles of bristles.

Description of a Second Embodiment

With reference to FIGS. 4, 5, 5A, 5B and 5B, these illustrate a variant embodiment of the system according to the present invention applied in a circular brush forming machine of the type described and illustrated in the previously cited patent IT-01.309.972 (i.e. EP-1.044.628.B1 and/or U.S. Pat. No. 6,578,928.B1).

In this second embodiment, the following are provided, in a way substantially similar to that described in the patents cited above:—twelve bristle insertion tubes 410;—a bristle clamp unit 420, comprising a first jaw 421, provided with axial holes 422 a, 422 b, etc., and a second jaw 423, provided with identical corresponding axial holes 324 a, 424 b, etc.;—a group of twelve telescopic tubes 430; and—a cutting unit 440, comprising a first rotating blade 441, provided with axial holes 442 a, 442 b, etc., having cutting downstream ends, etc., and a second fixed counter-blade 443, provided with identical corresponding axial holes 444 a, etc., having cutting upstream ends, in which the said axial holes 422 a, etc., 424 a, etc., 442 a, etc., 444 a, etc., the tubes 410, and the telescopic tubes 430 preferably have cross sections in the form of sectors of circles.

In this embodiment, the system comprising the drum 1 and nozzle 4 according to the present invention, described above with reference to FIGS. 1, 2 and 3, is positioned downstream of the cutting unit 440, being downstream of the blade 443 and made in one piece with it, and, more specifically, has the drum 1, provided with axial channels 2 a, 2 b, 2 c, etc., having cross sections, in the form of sectors of circles, corresponding in this case to the axial holes 444 a, 444 b, etc. of the counter-blade 443; the nozzle 4 IS provided with an outlet aperture 5; and the central shaft 20, which is optionally retractable and is optionally provided with the replaceable cone 20 a.

With this arrangement, after the formation of a preceding circular brush has been completed by the cutting of the bristles at the point T between the rotating blades 441 and 443 of the cutting unit 440, a new ring 8 is positioned by the means 9, a new nut 7 is positioned on the mandrel 6, and the said mandrel and nut 6-7 are brought up to the distal end 20 a of the central shaft 20.

When this operating configuration has been established, the bristles 10 are gripped by the bristle clamp unit 420, and the bristle clamp unit 420 is then moved towards the fixed bristle cutting unit 440, in which the axial holes 442 a, etc. of the rotating blade 441 are correctly aligned with corresponding channels 444 a-2 a, etc. of the cutter and drum 443-1, to cause a downstream advance of the free ends of the bristles 10, which, as stated above, are thus fed between the ring 8 and the mandrel and nut 6-7 in a circular ring arrangement, with a maximum diameter defined by the diameter of the aperture 5 and a minimum diameter defined by the diameter of the downstream end 20 a of the free shaft 20 and/or by the diameter of the mandrel and nut 6-7.

Thus the considerations stated above in respect of the execution of a change of configuration are applicable to this embodiment also.

The above description of the system has been given purely by way of example and without restrictive intent, and clearly, therefore, any modifications and/or variations suggested by practical experience can be made in respect of its use or application, within the scope of the following claims, which also constitute an integral part of the above description. 

1) System for feeding a plurality of bristles in a circular arrangement, particularly for use in automatic machines for forming circular brushes, characterized in that it comprises:—a drum (1) extending axially along its own axis (X1) and designed to form a plurality of axial channels (2 a, 2 b, 2 c, etc.), each having a cross section in the form of a sector of a circle, in a circular arrangement with the corresponding vertices orientated towards the central axis (X1) of the said drum (1);—a replaceable nozzle (B) positioned downstream of the said channels (2 a, 2 b, 2 c, etc.) with respect to the direction of feeding of the bristles and designed to form an internal truncated conical cavity tapered from the upstream to the downstream end and having an outlet aperture (5); and in that, in order to change the maximum diameter of the circular arrangement of the bristles being fed, the said nozzle (4) is replaced with one having an outlet aperture (5) with a different diameter (D1, D2). 2) System according to claim 1, characterized in that it comprises a central shaft (20; 20 a) designed to define the minimum diameter (D0) of the circular arrangement of the bristles being fed. 3) System according to claim 2, characterized in that the said central shaft (20; 20 a) is axially retractable and in that a mandrel and nut (6-7) are positioned next to the said central shaft (20; 20 a). 4) System according to claim 1, characterized in that a mandrel and nut (6-7) are positioned centrally within the outlet aperture (5). 5) System according to claim 2, characterized in that the said central shaft (20) has a distal end which can support a replaceable cone (20 a). 6) System according claim 1, characterized in that the said drum (1) has engagement and release means (3) designed to enable the nozzle (4) to be rapidly replaced. 7) System according to claim 5, characterized in that the said engagement and release means (3) have an external thread (3 a), positioned in the proximity of the downstream portion of the said drum (1), and designed to engage with an internal thread (3 b) formed in an upstream portion of the nozzle (4). 8) System according to claim 1, characterized in that it comprises expulsion members (11) in the form of multiple pistons (12 a, 12 b, etc.) designed to be inserted into the said channels (2 a, 2 b, etc.) and to move from the upstream end to the downstream end within the channels. 9) System according to claim 8, characterized in that it comprises the following stages of operation: a)—loading segments of bundles of bristles (10) into one or more circumferential channels (2 a, 2 b, etc.) of the drum (1); b)—inserting the pistons (12 a, 12 b, etc.) into the upstream ends of the said circumferential channels (2 a, 2 b, etc.) of the drum (1); c)—advancing the pistons (12 a, 12 b, etc.) along the said channels (2 a, 2 b, etc.) and towards the downstream end of the drum (1) to provide a corresponding advance of the segments of bundles of bristles (10) towards and beyond the outlet aperture (5) of the nozzle (4). 10) System according to claim 9, characterized in that a first station (S1) is provided for the execution of the operating stage “a)” and a second station (S2) is provided for the execution of the operating stages “b)” and “c)”, in that the first station (S1) is positioned outside the operating range of the circular brush forming line (400X) and in that the second station (S2) is positioned within the circular brush forming line (400X) of the corresponding forming machine. 11) System according to claim 10, characterized in that two or more drums (101, 201) having corresponding circumferential channels (2 a, 2 b, 2 c, etc.) are provided, and in that each drum (101, 201) is translated and made to halt in succession, firstly in the first station (S1) for the execution of stage “a)” and then in the second station (S2) for the execution of stages “b)” and “c)”. 12) System according to claim 10, characterized in that when one drum (101) is halted in the first station (S1) for the execution of stage “a)” a different drum (201) is halted in the second station (S2) for the execution of stages “b)” and “c)”. 13) System according to claim 1, characterized in that it comprises a rotating frame (301) designed to support and translate along a circular path two or more drums (101, 201) and in that the said rotating frame (301) translates the aforesaid drums (101, 201) and halts them in succession, firstly in a first station (S1) for the loading of segments of bundles of bristles (10) into one or more circumferential channels (2 a, 2 b, etc.) of the drum (101), and then (201) in a second station (S2) for the expulsion of the segments of bundles of bristles (10) towards the outlet aperture (5) of the drum. 14) System according to claim 13, characterized in that stopping and positioning means (104, 204) are provided, these means being carried by the rotating frame (301) and designed to prevent and allow the rotation of the corresponding drums (101, 201) about their axes (101 x, 201 x). 15) System according to claim 14, characterized in that the said stopping and positioning means (104, 204) are also designed to establish one or more rotational positions for each drum (101 and 201). 16) System according to any one of claim 9, characterized in that the first station (S1) and the second station (S2) are located along the circular path of translation of the drums (101, 201) and in that, when one drum (201) is halted in the second station (S2) for the execution of operating stages “b)” and “c)”, a different drum (101) is halted in the first station (S1) for the execution of operating stage “a)”. 17) System according to any one of claim 9, characterized in that the first station (S1) comprises:—a first unit (30) for feeding continuous bristles, designed to drive one or more bundles of bristles (11) longitudinally downstream;—a second unit (40) for guiding the bristles, designed to guide the bundles of bristles (11) into one or more channels (2 a, 2 b, etc.) of the drum (101) and to act as a counter-blade;—a third unit (50) for cutting, designed to cut, on command, the bundles of bristles (10) after their insertion into one or more channels (2 a, 2 b, etc.) of the drum (101);—a fourth unit (60) for rotating the drum (101), designed to rotate, on command, with calibrated angular movements, the drum (101) positioned and halted in the station (S2). 18) System according to any one of claim 9, characterized in that the second station (S2) comprises expulsion members (11) including a plurality of pistons (12 a, 12 b, 12 c, 12 d, etc.), each having a cross section in the form of a sector of a circle, designed to slide longitudinally within the aforesaid channels (2 a, 2 b, 2 c, 2 d, etc.) of the drum (201). 19) System according to claim 18, characterized in that the said pistons (12 a, 12 b, 12 c, 12 d, etc.) are positioned at the distal ends of corresponding rods (13 a, 13 b, 13 c, 13 d, etc.) whose opposite ends are fixed to a disc (14) which in turn is driven so that it moves longitudinally by means of a fluid dynamic piston (15). 20) System according to claim 18, characterized in that it comprises a guide element (16), comprising a plurality of aligning and centring channels (17 a, 17 b, 17 c, etc.), designed to contain and support the pistons (12 a, 12 b, 12 c, 12 d, etc.) in the correct configuration before their active stroke which expels the segments of bristles (10). 21) System according to any one of claims 1 comprising:—a bristle clamp unit 420,—a group of telescopic tubes 430, and—a cutting unit 440, characterized in that a drum (1) extending axially along its axis (X1) is provided downstream of and in association with the cutting unit (440), the drum being designed to form a plurality of axial channels (2 a, 2 b, 2 c, etc.), each having a cross section in the form of a sector of a circle, in a circular arrangement, with the corresponding vertices orientated towards the central axis (X1) of the said drum (1), and in that a replaceable nozzle (B) is provided downstream of the said channels (2 a, 2 b, 2 c, etc.) with respect to the direction of feeding of the bristles, the nozzle being designed to form an internal truncated conical cavity tapered from the upstream to the downstream end and having an outlet aperture (5). 